Another purpose of autohold is to provide a floor for unskilled players in a game of skill. They don't use it in Las Vegas specifically to allow players to make as many mistakes as possible. Optimal strategy on 9-6 JorB is 99.54% RTP. Reverse-optimal strategy (making the worst selection every time) is something like 3% RTP. Use of autohold puts an absolute worst case on the downside to video poker.
But do states set a min RTP for something like autohold? I always understood it as something that, technically, didn't have to be held to a PAR sheet or validated at all, really.
Slots with bonus games could auto-percentage themselves, right? Like how does Jackpot Party hold to a PAR sheet percentage when the player is pretty much making random pokes? Or are the pokes gaffed to reveal the five virtual reels that were spun earlier in the play?
Each of the state jurisdictions have different rules regarding minimum RTP percentages in games. With regards to poker autohold there aren't any rules that I'm aware of other than it has to be above the regulated minimum for the state. For example, Nevada had a minimum RTP requirement to 75%, so autohold would have to be at least that good. (Note to tourists: never play the slot machines in the Las Vegas airport. They're probably barely over the minimum required by law)